1. Souces
Some noise will occur from the switching power supply because it operates by controlling the switching high voltage. Their main sources are shown in Fig.2.1
- Switching transistor ----- (a)
- Output rectifier ----- (b)
- Output transformer ----- (c)
2. Pathways
The noises occurring from power supply are classified into several kinds as shown below based on the pathways. The pathways of noise are shown in Fig.2.1
- Line conduction: Conducted from input terminal of power supply
- Differential-mode noise: Occurring between the AC input lines ----- j
- Common-mode noise: Occurring between the AC input line and FG ----- k
- Output noise: Conducted from output terminals of power supply
- Differential-mode noise: Occurring between output lines ----- l
- Common-mode noise: Occurring between the output line and FG ----- m
- Radiated emission: Radiating from power supply or input/output line directly ----- n
(Radiation noise)
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